Tramcar power supply circuit

A tramcar power supply circuit comprises an auxiliary inverter, a charger, an AC/AC, a DC/AC, a first load, a second load, a first alternating current bus, a second alternating current bus and a direct current bus. One end of the AC/AC and the first load are electrically connected with the AC bus respectively, and the other end of the AC/AC and the second load are electrically connected with the second AC bus respectively; the alternating current end of the DC/AC is electrically connected with the second alternating current bus, and the direct current end is electrically connected with the direct current bus; the charger is electrically connected with the DC bus. Compared with the prior art, three phases of alternating current output are balanced, and normal operation of the load is not affected. In case of an emergency (e.g., when an auxiliary inverter fails), the third contactor may be opened, only to ensure that the critical load may maintain normal operation. And the output conversion of the AC/AC device